Sending emails over Transport Layer Security

Transport Layer Security (TLS) in Hosted Email Security (HES)

- Updated:
- 18 Jun 2018
- Product/Version:
- Hosted Email Security 3.0
- Platform:
- Not Applicable N/A

Transport Layer Security (TLS) is a protocol that helps to secure data and ensure communication privacy between endpoints. HES allows you to configure TLS encryption policies between HES and specified TLS peers. HES supports the following TLS protocols in descending order of priority: TLS 1.2, TLS 1.1 and TLS 1.0.

The Transport Layer Security (TLS) screen uses the following important terms:

TERM	DETAILS
TLS peer	HES can apply your specified TLS configuration with this domain during network communications.
Security level	Opportunistic: Communicates using encryption if the peer supports and elects to use TLS. Communicates without encryption if the peer does not support TLS Communicates without encryption if the peer supports TLS but elects not to use TLS Mandatory: Communicates using encryption if the peer supports and elects to use TLS Does not communicate if the peer does not support TLS Does not communicate if the peer supports TLS but elects not to use TLS To ensure messages can be received from the HES MTA, configure your firewall to accept email messages from the following HES IP address / CIDR blocks: Europe, the Middle East, Africa: • 52.48.127.192/26 • 52.58.62.192/26 • 52.58.63.0/25 All other regions: • 54.86.63.64/26 • 54.219.188.0/26 • 54.219.191.0/25
Status	Enabled: HES applies your specified TLS configuration to the peer Disabled: HES does not apply your specified TLS configuration to the peer Otherwise, the "Default" TLS configuration applies.
Default (TLS Peer)	This configuration applies to all domains that meet any of the following criteria: Domain is not on the peer list Domain is on the peer list, but is not enabled

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Transport Layer Security (TLS) in Hosted Email Security (HES)